Open DNS Resolver Test
Your current connection details:
- IP Address: 216.73.216.34
- City: Columbus
- Country: United States
- ISP: Amazon.com, Inc.
This tool checks if a given IP address is hosting an open DNS resolver. Open resolvers can be exploited for DDoS amplification attacks. Enter an IP below to test.
What is an Open DNS Resolver?
An open DNS resolver is a DNS server that allows recursive queries from any IP address. While convenient, it poses security risks as attackers can use it to amplify DDoS attacks by sending small queries that elicit large responses directed at victims.
Why Test for Open Resolvers?
- Security: Identify and fix vulnerabilities in your DNS setup.
- Prevent Abuse: Avoid your server being used in attacks, which could lead to blacklisting.
- Compliance: Many best practices recommend restricting DNS recursion.
To test, enter an IP and click Run Test. The tool sends a special query and checks the response.